#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <functional>
#include <set>
#include <numeric>
#include <stack>
#include <utility>
//#include "util.h"

using namespace std;
typedef long long lint;
typedef pair<lint, lint> Pii;

int main()
{
	int N;
	cin >> N;
	cout << (N % 2 ? '7' : '1');
	for (int i = 0; i < N / 2 - 1; i++)
		cout << '1';
	cout << endl;
	return 0;
}